That Tony Hawk Load time video honestly was bogus. They did a very shitty job porting it and it lags pretty much everywhere in the game. Poor example.
I'd like to see comparison video for The Darkness or something newer.
Also for your info the duplication of data does nothing for the actual load itself. Its for seek-times. Blu-ray has a disadvantage when it comes to DVD when it comes to seek times. Duplicating the data allows for the laser to find the data faster since Oblivion is so random because one minute your in Anvil, the next in some dungeon.
All 360 games are on DVD-9 I believe. Something to do with a DRM security section on each layer of the media. This also limits each layer to like 3.5GB of data so really developers need both layers anyway. This also means that data is mostly coming from the outer 75% or so of the disk.
Either way DVD-9 drops to 8x when read which has an average that is slower than the 2x Blu-ray drive. But its still very close to the same speed since it omits the slowest 25% of the disk so the average is increased. So more or less they are pretty much equal in that effect.
One advantage of Blu-ray is its constant read speed which does help significantly when it comes to streaming data. Hopefully third party developers start taking advantage of this like first party games are showing such as uncharted & Lair.
Another advantage would most likely be compression like the man above said. Since cell is such a powerful CPU its ability to handle compressed data should be excellent.
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